Vacuum pan



A. GRANTZDREFER VACUUM PAN Filed DBG. 30. 1926 b v v Patented Nov. 22,1927.

UNITED STATES .AUGUST GRNTZDBFFEB, OF MAGDEBURG, GERMANY.

vAcUUnr PAN.

Application led December 30, 1926, Serial No. 158,029, and in GermanySeptember 18, 1925.

creased at these parts of the heating surfaces Where the flow of theliquid is directed upwardly, as compared to other parts where the flowis directed downwardly. Thus the upward movement of the liquid isaccelers l5 ated by increased heating, while the retar- Ldation of theliquid flowing downwardly is reduced.

For the purpose of explaining the invention an example embodying thesame has been shown in the accompanying drawing in which the saineletters of reference have been used in all the views to indicate corre-vsponding parts. In said drawing,

Fig. 1, is a sectional elevation showing a vacuum pan,

Fig. 2, is a sectional elevation showing a radiator element on anenlarged scale,

Fig. 3, is a sectional plan view taken on the line 3-3 of Fig. 2, and

Fig. 4, is a sectional elevation showing a part of a radiator composedof a plurality of radiator elements.

In describing the invention reference will be made to a vacuum pandescribed in the patent of the United States No. 953,607

granted to me March 29, 1910, which vacuum pan however has been equippedwith my improved radiator.

As shown in 1, the vacuum pan con- 4U sists of a cylindrical vessel c'provided with a supply j and a discharge 7c for the juice, and with avapor eduction pipe l. The radiator consists of a plurality of annulare1`ements m concentrically located one within -the other.

My invention relates more particularly to the construction of theradiator, -and in describing the invention I .shall at first makereference to the example shown 1n Figs. 2

and 3. It may be assumed that only a sinple radiator element such as isshown in Figs. 2 and 3 is used in the vacuum pan the juice lowingupwardly at the outside of the said element and downwardly at the innerside thereof. As shown the radiator a is annular in form. Internally ofthe radiator there is a vertical cylindrical partition wall b which isfixed to the bottom of the radiator and extends to a point away from thetop thereof, thus providing anrannular passage o through which the outerand inner chambers e and f of the radiator communicate 'with each other.v The heating medium such as steam is admitted through a pipe d to thebottom part of the outer chamber e, and the water of condensation isdischarged from the bottom part ofthe inner chamber f through a pipe g,the pipes d and g being located at diametrically opposite parts. Thusthe heating medium flows upwardly through the outer annular chamber c,and downwardly through the inner chamber f, and the outer wall of theradiator is intensely heated while the heating of the inner wall iscomparatively small. Therefore the flow of the liquid to be heatedmoving upwardly in contact with the outer wall of the radiator isassisted by the heat transmitted thereto, while the retardation of theflow of the liquid moving downwardly in contact with the inner wall ofthe radiator is comparatively small by reason of the reducedtransmission of heat from the inner wall of the radiator.

Preferably a few openings or drainage ports o are provided at the bottompart of the partition b to permit the water con A densed within thechamber e to flow directly t0 the discharge pipe g. y

In cases where the liquid flows upwardly through the radiator anddownwardly past the outside thereof the heating medium is admittedthrough the pipe g, while the water of condensation is removed throughthe pipe d.

In Fig. 4 I have shown a plurality of concentric annular radiators aprovided with partitions b dividing the radiators into chambers e and fcommunicating with each other through annular passages c, theconstruction of the elements being the same as has been described withreference to Figs. 2 and 3. As shown in the said ligure, the inletpipesa1 and the discharge pipes g1 communicate respectively withadjacent chambers of successive radiators, so that in adjacent chambersof successive radiator elements the direction of the flow of the heatingmedium is the same, the direction of the flow 4of the heating mediumbeing indicated by arrows Therefore the upward flow of the liquidbetween the first and the second element taken from the right in Fig. 4isL accelerated by the heat. transmitted to thel liquid from bothsides.' The flowof the liquid to be heated is indicated by arrows y.

lVhile in ldescribinglr the invention refer ence has been made toparticular examples embodying the same I wish it to be understod that myinvention is not limited to the form of the radiatorsl shown in thedrawing, nor is it limited inr other respects except as indicated inthetappended claims..`

` I claim: p

1. A vaeuum pan having therein a hollow annular radiator, a I- iartitionextending upward from the bottom ot'l the radiator and dividing Vit intoinner and outer annular,

chamber-SQ means for admitting aI heating.,r medium into one ot'theannular ehan'ibers,

a passage at the top ofthe partition for aol-l nuttingr the heatingrmedium-to fthe other chamber, and a port leading' out ofthe lastnamedchamber at the bottom of4 the same.

2. A vacuum pan havin;r therein a Series of concentric hollow annularradiators, partitions extendingr upward from the bottom ofthe radiatorsand terminating short of they upperl ends of the same to provide annularchambers `eparated by the partitions Whereb v a heatingl medium admittedto one cha1nber passes ore'r the partition and `heats the other chamberto a lesser degree than the lli-St. an inlet port at one Side ot' eachpartaition and an outlet port at the other side, the arrangement ofparts being such as to bring two 'highly heated chambers intojuxtaposition between two less' highly heated cham-v.

chamber. and a port leading ont of the lastnamed chamber at the bottomof the same. In tetnnony whereof I havehereunt() Set; my hand.

AUGUSTGRNTZDRFFER.

